Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
Polyembryony
Presence of more than one embryo in a seed is termed polyembryony. The phenomenon, first discovered in orange seeds by Leeuwenhoek (1719), attracted considerable attention because of its potential for application in and horticulture. Polyembryony is broadly classified into simple and multiple, depending on whether the supernumerary arises in one or more embryo sacs in the ovule. Simple polyembryony may be sexual or asexual. In sexual polyembryony embryos may originate from the fertilized egg and synergids, or by budding or cleavage of the polyembryony cells or suspensor of the zygotic embryo.
Asexual embryos are produced within the embryo sac without fertilization. Embryos may also originate from diploid nucellar or integumentary cells of the ode and grow into the embryo sac. These embryos are termed adventive or sporophytic. Multiple polyembryonies involve production of accessory embryos from two or more embryo sacs in the same ovule. For example, in the sea Island cotton, Gossypium barbadense, fertilization of egg in one embryo sac stimulates the induction of embryo from an unfertilized egg in the adjacent embryo sac within the same ovule. Thus, diploid-haploid twin embryos are produced in the seed.
Illustrate the name of surgical needle The surgical needle is comprised of 3 parts: the needle point, the needle body, and the swaged (press-fit) end. Needle may be broadl
Name the high-energy complex generated during the conversion of succinyl CoA to succinate in the citric acid cycle GTP or ATP is the high-energy complex generated during th
Brain anatomical coordinate systems are the first potential point of confusion, as there are different ones due to the fact that research is conducted in different species where d
Food Gathering and Hunting : Food Gathering and Hunting In order to live, man needed to eat and to protect himself from the weather and animals. For both purposes he found it
ENDOPLASMIC RETICULUM (ER) Eucaryotic celIs have two major compartments- nucleus and cytoplasm. Cytoplasm was known to have no structure until the discovery of electron micrsscop
Define Biosynthesis and Secretion of Thyroid Hormones? Histologically, the functional cells of the thyroid gland are arranged in follicles, which surround a central lumen conta
Q. What is a mixed gland? Why the pancreas is considered a mixed gland? Mixed gland is a gland that produces exocrine and endocrine secretions. The pancreas is an example of
Is the epithelium vascularized? How do nutrients and oxygen reach the epithelium? Why is this feature a significant evolutionary acquisition? Epithelia are not vascularized (ca
Can you recognize the eight stages of meiosis based on the location and behavior of the chromosomes? Drag the diagrams of the stages of meiosis onto the targets so that the four st
One may find leucocytosis with predominant polymorphonuclear cellular response in patients of ARF in presence of acute some throat. Throat Culture When patient presents as AR
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd